In the foreseeable future? Well that's not ALL science is about.Mining resources on Mars and bringing them back to earth has absurd investment costs that prohibit it from being profitable, at least for the forseeable future. Hell, there are fossil fuel deposits on earth that are too costly to make it worthwhile to retrieve.
And we'll know this how? BY EXPLORING MARS! It's also not about what you think, it's about what you can produce evidence for.We already know that mars is not capable of sustaining human life. I've been over the argument as to why a "bubble colony" on mars would be pointless too many times and I'm hardly interested in recanting it yet again. Terraforming is so ridiculously out of the scope of our ability right now (if it ever even will be, which is questionable to say the least) that I think it's absurd to even seriously consider.
It's not exclusive to Earth, hopefully. We need to find a home for the future (as I've told you before).The fact is that the continued existence of the human species is tied to earth. And will be for a very, very, VERY long time. An amazingly cool rover on mars doesn't do anything to change this.